Configure MPLS on the Cisco Catalyst 8540 MSR Enhanced ARM (ARM 2) with PVPs
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Introduction
This document provides a sample configuration for the Multiprotocol Layer Switching (MPLS) on the Catalyst 8540 Enhanced ATM Router module (ARM). The ARM module's main function is to increase the capability to connect two different worlds - packet/switching (which is frame based) and ATM (which is cell based). This functionality could be extended to the MPLS as well. The Catalyst 8540 MSR with an Enhanced ARM can be installed at the edge of a packet and cell based network with both MPLS modes enabled in the same chassis. The Enhanced ARM (ARM2) on the Catalyst 8540 MSR is required for Label Edge Routing (LER) functionality on ATM interfaces - it acts as the proxy interface for every incoming and outgoing ATM interface in the Label Switch Path (LSP) to do the MPLS packet processing. The Catalyst 8540 is ideally suited for cell-mode to frame-mode MPLS integration (accomplished by deployment of the Enhanced ATM router module). Up to two ARM2 cards can be used in a single chassis.
This document provides examples of two different configurations that explain the usage of the ARM 2.
- Use the Enhanced ARM for cell mode (terminating cell mode MPLS on the ARM 2)
- Use the Enhanced ARM for frame mode MPLS over ATM over ATM VP tunnel.
Prerequisites
Requirements
There are no specific requirements for this document.
Components Used
The information in this document is based on these software and hardware versions:
- Two Cisco C8540 MSRs, Cisco IOS® version 12.1(10)EY (256 MB DRAM)
- Cisco C8510 MSR, Cisco IOS version Version 12.1(7a)EY1 (64 MB DRAM)
- C8540-ARM2 (Enhanced ATM Router module)
- WAI-OC3-4MM (4 port OC-3 line card)
- C85MS-4F-OC12MM (4 port OC-12 line card)
The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.
Configure
In this section, you are presented with the information to configure the features described in this document. The OSPF was used as an internal routing protocol.
Network Diagram
This document uses the network setup shown in this diagram:
The previous diagram is used for these scenarios:
- Use the Enhanced ARM for cell mode (terminating cell mode MPLS on the ARM 2)
- Use the Enhanced ARM for frame mode MPLS over ATM over ATM VP tunnel.
Notice that the configuration for the cell mode uses the path C8540MSR-2 to C8510MSR-3 to C8540MSR-1, while the configurations described in this document for frame mode uses the VP Tunnel to connect C8540MSR-2 and C8540MSR-1.
Use the Enhanced ARM for Cell Mode MPLS
On the Catalyst 8540 MSR cell-mode MPLS is supported on all ATM interfaces and works in parallel with ATM signaling (such as ILMI) and ATM routing (PNNI). The cell-mode MPLS is enabled when you add the mpls ip interface command (or tag-switching ip in older Cisco IOS versions) and requires establishment of one unidirectional Label Virtual Circuit (LVC), or a Tag Virtual Circuit (TVC) for each Forwarding Equivalent Class (FEC) or an IP destination. Label virtual circuits are known as head-end LVC at the originator LER, tail-end LVC at the destination LER, and transit LVC at the LSR. In case a Cat8540 MSR acts as a pure ATM LSR (MPLS P router), the CPU does not establish head-end LVC for the routes learned in the ATM core. The traffic that originates from the CPU and is destined to a remote LSR is sent over the MPLS control VC. An ATM interface could be linked to an ARM2 port and the LVC will terminate on the ARM2 port if that is the case. In fact, when you link an ATM interface to an ARM2 port, the ARM2 acts as an ATM LER (MPLS PE router) and will initiate head-end LVC (terminating LVC) for the routes learned in the ATM core.
ATM interfaces, ATM VP, and hierarchical VP tunnels can be configured to terminate on the ARM2 port (available on 8540 MSR platform only). For load balancing purposes, ATM interfaces can be linked to either of the two ports of an Enhanced ARM . In order to terminate cell mode MPLS on an ARM2 port, use the mpls-forwarding interface ATMx/y/z interface configuration command, where ATMx/y/z is the Enhanced ARM port). That command applies to the main interface only.
Configurations
C8540MSR-2 (Catalyst 8540MSR)
C8540MSR-2#show hardware
C8540 named c8540MSR-2, Date: 04:46:41 UTC Mon Feb 10 2003
Slot Ctrlr-Type Part No. Rev Ser No Mfg Date RMA No. Hw Vrs Tst EEP
---- ------------ ---------- -- -------- --------- -------- ------- --- ---
0/* Super Cam 73-2739-03 B0 03170SXG Apr 27 99 0 3.0
0/1 155MM PAM 73-1496-03 A0 09006167 Aug 01 95 00-00-00 3.1 0 2
2/* OCM Board 73-2833-06 A0 03210XWB May 26 99 0 6.0
2/0 QUAD 622 Gen 73-2852-05 A0 03210YN8 May 26 99 0 5.0
9/* ETHERNET PAM 73-3754-05 A0 03374A9K Mar 17 99 0 4.1
12/* CMPM Card 73-3944-05 A0 04209EX0 Aug 29 00 0 5.0
12/0 ARM2 PAM 73-5533-01 A0 0424A160 Aug 29 00 0 5.1
12/1 ARM2 PAM 73-5533-01 A0 0424A183 Aug 29 00 0 5.1
C8540MSR-2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
C8540MSR-2(config)#int atm 0/1/2
C8540MSR-2(config-if)#mpls ip
! Cell mode MPLS enabled
C8540MSR-2(config-if)#ip add 10.254.14.237 255.255.255.252
C8540MSR-2(config-if)#mpls label protocol ldp
! LDP enabled on the interface
C8540MSR-2(config-if)#end
C8540MSR-2#show atm vc int atm 0/1/2
Interface VPI VCI Type X-Interface X-VPI X-VCI Encap Status
ATM0/1/2 0 5 PVC ATM0 0 57 QSAAL UP
ATM0/1/2 0 16 PVC ATM0 0 37 ILMI UP
ATM0/1/2 0 18 PVC ATM0 0 202 PNNI UP
ATM0/1/2 0 32 PVC ATM0 0 256 SNAP UP
C8540MSR-2#show mpls int atm 0/1/2
Interface IP Tunnel Operational
ATM0/1/2 Yes (ldp) No Yes (ATM labels)
C8540MSR-2#show mpls int atm 0/1/2 det
Interface ATM0/1/2:
IP labeling enabled (ldp)
LSP Tunnel labeling not enabled
MPLS operational
MTU = 4470
ATM tagging: Label VPI = 1
Label VCI range = 33 - 65535
Control VC = 0/32
C8540MSR-2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
C8540MSR-2(config)#int atm 0/1/2
C8540MSR-2(config-if)#mpls-forwarding int atm 12/0/1
! Terminate Cell mode MPLS on ARM2
C8540MSR-2(config-if)#end
C8540MSR-2#show atm vc int atm 0/1/2
Interface VPI VCI Type X-Interface X-VPI X-VCI Encap Status
ATM0/1/2 0 5 PVC ATM0 0 57 QSAAL UP
ATM0/1/2 0 16 PVC ATM0 0 37 ILMI UP
ATM0/1/2 0 18 PVC ATM0 0 202 PNNI UP
ATM0/1/2 0 32 PVC ATM12/0/1 2 120 SNAP UP
ATM0/1/2 1 35 TVC(O) ATM12/0/1 2 121 MUX UP
ATM0/1/2 1 36 TVC(O) ATM12/0/1 2 122 MUX UP
ATM0/1/2 1 37 TVC(O) ATM12/0/1 2 123 MUX UP
ATM0/1/2 1 41 TVC(O) ATM12/0/1 2 124 MUX UP
C8540MSR-2#show mpls int
Interface IP Tunnel Operational
FastEthernet9/0/0 Yes (ldp) No Yes
ATM0/1/2 Yes (ldp) No Yes (ATM labels)
! Note: ATM labels -> Cell mode
ATM12/0/0.60 Yes(ldp) No Yes
C8510MSR-3 (Catalyst 8510MSR)
C8510MSR-1#show running-config
Building configuration...
! interface Loopback0
ip address 10.254.231.1 255.255.255.255
! interface ATM0/0/2
ip address 10.254.14.245 255.255.255.252
logging event subif-link-status
no atm ilmi-keepalive
mpls label protocol ldp
tag-switching ip
!
interface ATM0/0/3
ip address 10.254.14.238 255.255.255.252
logging event subif-link-status
load-interval 30
no atm ilmi-keepalive
mpls label protocol ldp
tag-switching ip
!
router ospf 1
log-adjacency-changes
network 10.0.0.0 0.255.255.255 area 0.0.0.0
Use the Enhanced ARM for Frame Mode MPLS over ATM VP Tunnels
The Catalyst 8540 MSR with an Enhanced ARM line card can also run frame mode MPLS over ATM. In order to illustrate usage of the Enhanced ARM in the frame mode MPLS, view the "Use the Enhanced ARM for Frame Mode MPLS over ATM Tunnels" configuration example located in this document. ATM VP tunnels are sometimes used to connect two sites. Instead of configuring individual VCs, the large "pipe" VP tunnel can be used. In order to illustrate this option, which is normally used by companies that need a large number of VCs between the remote sites, the VP tunnel was created between C8540MSR-1 and C8540MSR-2. Two 8540MSR's are directly connected through the ATM2/0/0 (OC-12, an hierarchical VP tunnel ATM2/0/0.60 has been used). Both Enhanced ARM modules run frame mode MPLS on an ATM subinterface. For that reason, a data PVC/aal5snap has been configured.
This example displays the steps performed in C8540MSR-1 in order to configure the Enhanced ARM for Frame Mode MPLS over ATM VP Tunnels.
C8540MSR-1 (Catalyst 8540MSR)
C8540MSR-1#show hardware
C8540 named c8540-r6-1, Date: 04:46:41 UTC Mon Feb 10 2003
Slot Ctrlr-Type Part No. Rev Ser No Mfg Date RMA No. Hw Vrs Tst EEP
---- ------------ ---------- -- -------- --------- -------- ------- --- ---
0/* Super Cam 73-2739-03 B0 03170SUQ Apr 27 99 0 3.0
0/1 155MM PAM 73-1496-03 A6 03199939 Aug 01 95 00-00-00 3.1 0 2
2/* OCM Board 73-2833-06 A0 03210XWB May 26 99 0 6.0
2/0 QUAD 622 Gen 73-2852-05 A0 03210YN8 May 26 99 0 5.0
9/* ETHERNET PAM 73-3754-05 A0 031111EO Mar 17 99 0 4.1
11/* CMPM Card 73-3944-05 A0 04209F5E Aug 29 00 0 5.0
11/0 ARM2 PAM 73-5533-01 A0 0424A162 Aug 29 00 0 5.1
11/1 ARM2 PAM 73-5533-01 A0 0424A17C Aug 29 00 0 5.1
C8540MSR-1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
C8540MSR-1(config)#atm hierarchical-tunnel
C8540MSR-1(config)#atm connection-traffic-table-row index 60 cbr pbr 120000
C8540MSR-1(config)#int atm 2/0/0
C8540MSR-1(config-if)#atm pvp 6 hierarchical rx-cttr 60 tx-cttr 60
C8540MSR-1(config-if)#int atm 2/0/0.60
C8540MSR-1(config-subif)#exit
C8540MSR-1(config)#int atm 11/0/0.60 point-to-point
C8540MSR-1(config-subif)#ip address 10.254.14.10 255.255.255.252
C8540MSR-1(conf-sif)#atm pvc 2 60 pd on encap aal5snap int atm 2/0/0.60 60 60
C8540MSR-1(config-subif)#mpls label protocol ldp
C8540MSR-1(config-subif)#mpls ip
C8540MSR-1(config-subif)#end
C8540MSR-1#show atm vc int atm 11/0/0.60 | include ATM2/
ATM11/0/0 2 60 PVC ATM2/0/0.60 60 60 SNAP UP
C8540MSR-1#show mpls int
Interface IP Tunnel Operational
ATM0/0/1 Yes (ldp) No Yes (ATM labels)
ATM0/0/2 Yes No No (ATM labels)
FastEthernet9/0/4 Yes No No
ATM0/1/0 Yes (ldp) No No (ATM labels)
ATM11/0/1 Yes No No
ATM11/0/0.5 Yes (tdp) No Yes
ATM11/0/0.60 Yes (ldp) No Yes
! Note: no ATM labels -> Frame mode
C8540MSR-1#show mpls int atm 11/0/0.60 det
Interface ATM11/0/0.60:
IP labeling enabled (ldp) LSP Tunnel labeling not enabled
MPLS operational MTU = 4470
C8540MSR-1#show atm vp
Interface VPI Type X-Interface X-VPI Status
ATM2/0/0 60 PVP HIE. TUNNEL
Configurations
The relevant parts of the MSR's configurations from the network diagram are shown next:
- C8540MSR-2
- C8540MSR-1
- C8510MSR-3 (This configuration is the same as the one in Use the Enhanced ARM for Cell Mode MPLS.)
C8540MSR-2 (Catalyst 8540MSR)
C8540MSR-2#show running-config
Building configuration...
!
mpls label protocol ldp
atm hierarchical-tunnel
atm connection-traffic-table-row index 60 cbr pcr 120000
!
interface Loopback0 ip address 10.254.225.1 255.255.255.255
!
interface ATM0/1/2
description IP subnet 10.254.14.236
ip address 10.254.14.237 255.255.255.252
ip ospf cost 4
no atm ilmi-keepalive
mpls label protocol ldp
tag-switching ip
mpls-forwarding interface ATM12/0/1
! terminates cell mode MPLS on the ARM module
interface ATM2/0/0
no ip address
no atm ilmi-keepalive
atm pvp 60 hierarchical rx-cttr 60 tx-cttr 60
!
interface ATM2/0/0.60 point-to-point
description Hierarchical VP Tunnel for frame mode MPLS over ATM
!
interface FastEthernet9/0/0
ip address 10.64.0.2 255.255.255.252
load-interval 30
duplex full
speed 100
tag-switching ip
mpls-forwarding interface ATM12/0/0
! EPIF based FE line cards do not support MPLS natively
! link to ARM2 (ATM 12/0/0) enables MPLS on those cards
interface ATM12/0/0
description Enhanced ARM - ARM2
no ip address
!
interface ATM12/0/0.60 point-to-point
description ARM2 subinterface used for Frame mode MPLS over HVPT 60
ip address 10.254.14.9 255.255.255.252
atm pvc 2 60 pd on encap
al5snap interface ATM2/0/0.60 60 60
mpls label protocol ldp tag-switching ip
! an ARM2 point-to-point subinterface (point-to-point) supported as of
! Cisco IOS release 12.1(10)EY only
! router ospf 1
router-id 10.254.225.1
log-adjacency-changes network 10.0.0.0 0.255.255.255 area 0.0.0.0
!
C8540MSR-1 (Catalyst 8540MSR)
C8540MSR-1#show running-config Building configuration... sdm sram Label 32768 sdm sram Tag-Cos 32768
! tag-switching tdp router-id Loopback0 ! atm hierarchical-tunnel atm connection-traffic-table-row index 60 cbr pcr 120000 ! interface Loopback0 ip address 10.254.232.1 255.255.255.255 ! interface ATM0/1/0 ip address 10.254.14.246 255.255.255.252 ip ospf cost 100 logging event subif-link-status no atm ilmi-keepalive mpls label protocol ldp tag-switching ip mpls-forwarding interface ATM11/0/0 ! interface ATM2/0/0 no ip address no atm ilmi-keepalive atm pvp 60 hierarchical rx-cttr 60 tx-cttr 60 ! interface ATM2/0/0.60 point-to-point no atm ilmi-keepalive ! interface FastEthernet9/0/4 ip address 10.177.1.1 255.255.255.252 tag-switching ip mpls-forwarding interface ATM11/0/0 ! interface ATM11/0/0 no ip address ! interface ATM11/0/0.60 point-to-point ip address 10.254.14.10 255.255.255.252 atm pvc 2 60 pd on encap aal5snap interface ATM2/0/0.60 60 60 mpls label protocol ldp tag-switching ip ! router ospf 1 router-id 10.254.232.1 log-adjacency-changes network 10.177.1.0 0.0.0.3 area 0.0.0.0 network 10.254.0.0 0.0.255.255 area 0.0.0.0 ! end
Verify
Use these commands in order to verify if the MPLS is up and works properly:
- show mpls interfaces [detail] - Verifies whether a label distribution protocol is running on the requested interface
- show mpls ldp neighbors - Displays the status of LDP sessions/neighbor connections
- show mpls ldp discovery - Determines the LDP identifier and LDP hello exchange status of the interfaces
- show mpls forwarding-table - Checks the MPLS Forwarding Information Base (FIB) table
- show mpls ip binding - Checks the MPLS IP Label Information Base (LIB) table
C8540MSR-1#show mpls interfaces Interface IP Tunnel Operational ATM0/0/1 Yes (ldp) No Yes (ATM labels) ATM0/1/0 Yes (ldp) No Yes (ATM labels) ATM11/0/0.60 Yes (ldp) No Yes
C8540MSR-1#show mpls interfaces atm 0/1/0 detail Interface ATM0/1/0: IP labeling enabled (ldp) LSP Tunnel labeling not enabled MPLS operational MTU = 4470 ATM tagging: Label VPI = 1 Label VCI range = 33 - 65535 Control VC = 0/32
C8540MSR-1#show mpls ldp neighbor Peer LDP Ident: 10.254.225.1:0; Local LDP Ident 10.254.232.1:0 TCP connection: 10.254.225.1.646 - 10.254.232.1.11016 State: Oper; Msgs sent/rcvd: 106/93; Downstream Up time: 00:56:36 LDP discovery sources: ATM11/0/0.60, Src IP addr: 10.254.14.9 Addresses bound to peer LDP Ident: 2.2.2.1 10.64.4.190 10.254.225.1 1.254.8.1
10.254.14.221 10.254.14.225 10.254.14.237 10.254.14.9 Peer LDP Ident: 10.254.231.1:4; Local LDP Ident 10.254.232.1:2 TCP connection: 10.254.14.245.646 - 10.254.14.246.11017 State: Oper; Msgs sent/rcvd: 45/45; Downstream on demand Up time: 00:38:27 LDP discovery sources: ATM0/1/0, Src IP addr: 10.254.14.245
C8540MSR-1#show mpls ldp discovery Local LDP Identifier: 10.254.232.1:0 Discovery Sources: Interfaces: ATM0/1/0 (ldp): xmit/recv LDP Id: 10.254.231.1:4; IP addr: 10.254.14.245 ATM11/0/0.60 (ldp): xmit/recv LDP Id: 10.254.225.1:0
C8540MSR-1#show mpls forwarding-table Local Outgoing Prefix Bytes tag Outgoing Next Hop tag tag or VC or Tunnel Id switched interface 16 Untagged 10.254.14.220/30 0 AT11/0/0.60 point2point 17 27 10.254.247.1/32 0 AT11/0/0.60 point2point 20 22 10.254.14.240/30 0 AT11/0/0.60 point2point 21 26 10.254.231.1/32 0 AT11/0/0.60 point2point 24 Untagged 10.254.14.224/30 0 AT11/0/0.60 point2point 25 24 10.254.227.1/32 0 AT11/0/0.60 point2point 26 Pop tag 10.254.14.236/30 0 AT11/0/0.60 point2point 33 Untagged 10.254.221.1/32 0 AT11/0/0.60 point2point 45 18 10.254.14.12/30 0 AT11/0/0.60 point2point
SORBRCV0(c8540-r6-1)#show mpls ip bind ... 10.254.221.1/32 in label: 33 10.254.222.1/32 in label: 36 out vc label: 1/53 lsr: 10.254.233.1:2 ATM0/0/1 Active ingress 4 hops (vcd 49) 10.254.223.1/32 in label: 34 out vc label: 1/54 lsr: 10.254.233.1:2 ATM0/0/1 Active ingress 3 hops (vcd 43) 10.254.225.1/32 in label: 28 out label: imp-null lsr: 10.254.225.1:0 10.254.227.1/32 in label: 25 out label: 24 lsr: 10.254.225.1:0 10.254.232.1/32 in label: imp-null in vc label: 1/34 lsr: 10.254.233.1:2 ATM0/0/1 Active egress (vcd 59) out label: 33 lsr: 10.254.225.1:0 10.254.233.1/32 in label: 29 out label: 34 lsr: 10.254.225.1:0 out vc label: 1/60 lsr: 10.254.233.1:2 ATM0/0/1 Active ingress 2 hops (vcd 38) 10.254.242.1/32 in label: 19 out vc label: 1/61 lsr: 10.254.233.1:2 ATM0/0/1 Active ingress 5 hops (vcd 50) 10.254.247.1/32 in label: 17 out label: 27 lsr: 10.254.225.1:0
Troubleshoot
For additional information on MPLS troubleshooting, refer to the MPLS Troubleshooting general troubleshooting document which explains MPLS troubleshooting in detail.
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